There are a few reasons why you may have lost access to your OneDrive account, folders, or files.
Your access to OneDrive is directly connected with your University affiliations. If there is a change to your status as an active student or employee, you will lose access to your OneDrive as a result.
If you have lost access to files or folder that have been shared with you, please contact the document owner. If the owner is no longer available, it may be that their OneDrive account has been removed due to a change in their active student or employee status. In this case, open an Incident to have the data recovered.
If there are files or folders missing from your OneDrive, it may be that they were accidentally deleted by yourself or another that you had shared them with. Depending on how much time has passed, you may be able to recover these using the following directions from Microsoft.
Restore deleted files or folders in OneDrive
OneDrive accounts, folders, and files that have been removed due to the scenarios above are kept for 93 days before they are permanently deleted. If you believe any of these have been removed in error, please open an Incident as soon as possible to prevent permanent data loss.